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Note 2 - Basis of Presentation and Recent Accounting Pronouncements (Tables)
 3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Error Corrections and Prior Period Adjustments [Table Text Block]
   
Balance Sheet
  
   
Warrant Liability
    
Additional Paid-in Capital
    
Accumulated Deficit
  
                         
Balance as of 12/31/2018 (Prior to Adoption of ASU 2017-11)
  
 $
925
   
 $
279,306
   
 $
(252,809
)
Reverse beginning balance as of January 1, 2018
    
(2,192
 )    
6,970
      
(4,778
 )
Change in fair value of warrant liability
    
1,267
      
-
      
(1,267
 )
Balance as of 12/31/2018 (After Adoption of ASU 2017-11)
  
 $
-
    
 $
286,276
   
 $
(258,854
)
   
Statement of Operations
  
   
Change in Value of Warrant Liability
    
Net Loss and Comprehensive Loss
  
                 
Balance as of 3/31/2018 (Prior to Adoption of ASU 2017-11)
  
 $
(275
)
  
 $
(2,438
)
Reverse beginning balance as of January 1, 2018
    
-
      
-
  
Change in fair value of warrant liability
    
275
      
275
  
Balance as of 3/31/2018 (After Adoption of ASU 2017-11)
  
 $
-
    
 $
(2,163
)